Number of 7-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.

A208828

Number of 7-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero.

Terms

    a(0) =32a(1) =609a(2) =4390a(3) =19657a(4) =65134a(5) =177097a(6) =417204a(7) =883409a(8) =1720628a(9) =3135633a(10) =5410378a(11) =8921049a(12) =14153874a(13) =21728505a(14) =32416136a(15) =47167393a(16) =67132584a(17) =93694273a(18) =128489486a(19) =173447145a(20) =230812054a(21) =303187369a(22) =393560188a(23) =505349233a(24) =642431868a(25) =809197169

External references